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Patented Dec. 8, 1896..

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UNITED STATES PATENT GEFICE.

HEINRICH STOLL AND FRIEDRICH MAERCKLIN, OF REUTLINGEN, GERMANY.

KNITTING--hf'i/CHINEl SPECIFICATION forming part of Letters Patent No.572,839, dated December 8, 1896. Application i'lled April 6, 1895.Serial No. 544,784. (No model.) Patented in Germany November 24, 1893,No. 77,951.

To a/ZZ whom it may concern,.- A

Be it known that we, HEINRICH SToLL and FRIEDRIcH MAERCKLIN, citizens ofGermany, and residents of Reutlingen, Germany, have invented certain newand useful Improvements in Knitting-Machines, (patented in GermanyNovember 24, 1893, No. 77,951,) of which the following is aspecification.

Our invention relates to improvements in straight-knitting machines, andparticularly to an improvement on the invention patented by us July 21,1894, No. 523,820.

The object of our invention is to provide a simple and more convenientintermediate cam n and means for operating the same and to avoid theprincipal disadvantage of the construction shown in said patent, whichwill be mentioned hereinafter.

Vith this object in View our invention consists in the features, detailsof construction, and combinations of parts, which will first bedescribed in connection with the accompanying drawings and thenparticularly pointed out in the claims.

In the drawings, which illustrate only so much of a fiat-knittingmachine as is necessary to explain the features of the presentinvention, Figure 1 is a bottom plan view of the cam mechanism. Fig. 2is a transverse sectional view of the same. Fig. 3 is a detail View, tobe explained hereinafter.

Referring to the drawings, it will be seen that the two needle-beds areplaced in one plane and a double needle ca is employed. This doubleneedle is pushed alternately from the needle channel or slot of oneneedle-bed e to the corresponding channel of the opposite needle-bed cby the operation of the carriage. This is effected by means of the jacksb, which are provided with the toothed inner ends c and with theupward-extending lug or arm d, which projects above the slottedneedle-bed, so as to be engaged by the cams, in order that the jacks maybe pushed to and fro. Each cam device consists of an outer stationarycam m, an inner stationary cam n', two laterally-adjusted cams m', andan intermediate movable cam or block n, as will be plain from Fig. 1.The outer stationary cam fm has a concavity at its inner end, in whichthe said intermediate cam 'n is located.

The above mechanism, with the exception of the intermediate cam or blockn., is similar to the mechanism described in our previous patent abovereferred to, while the said intermediate block n constitutes, incombination with the other parts, the present invention. In the saidpatent above referred to this intermediate block n was made verticallymovable in the raceway, being lifted and held up out of its operativeposition by a handlever in order that the jacks on its side of themachine might not be moved by the operation of the carriage. By thisarrangem entwhen the cam is raised and the machine is run at a greatspeed the tongues of the jacks are thrown back and forth in the racewayat' the point beneath the cam, whereby the jacks fail to operateproperly and irregular knitting is the result.

This disadvantage is avoided in the present invention, wherein the saidintermediate cam or block n is made rotatable, being placed in aneccentric manner with relation to its axis of rotation, so that when inone position the cam will operate the jacks to the full extent of theirthrow, While when rotated to the opposite position the raceway oppositethe said cam-block fn, will be enlarged to such an extent as to permitthe jacks to pass through the raceway without being forced inward totheir full extent, whereby the jacks fail to engage the needles, andconsequently the opposite side of the machine, which is supposed to haveits cam-block n adjusted to throw the jacks to their full extent, willdo the knitting. As will be seen from Fig. 1, the cam-block aispolygonal in outline and has two operating-faces on opposite sides ofthe block, the latter being attached to the stud o, which projectsupward through the plate f and is provided with a knob o', a spiralspring o2 surrounding the stud and normally tending to force the studand cam-block n downward. Between the plate f and the knob is placed ablock f through which the stud 0 projects and which is provided with twosmall holes or recesses one hundred and eighty degrees apart. The knobis provided with a single downward-projecting teat or button t, which isadapted to enter either one of the said holes or recesses, therebyholding the stud o and the cam-block n against accidental rotation. Thesaid polygonal cam-block is so located on the stud o that one side oroperating-face is IOO farther away from the center of said stud than theother side, so that when placed with the iirst-mentioned side inward itcontracts the raceway between the cams and causes the jacks to moveinward to their full extent, while when placed with the other side oroperating-face inward toward the raceway the latter is enlarged and thejacks are not thrown to their full extent inward, thereby rendering saidjacks inoperative. This rotation of the cam-block n and the stud o isdone by lifting up on the knob o', so as to compress the the cam cannotbe thrown out of adjustment by the knob catching in the sleeve of theoperator.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent, is-

In a knitting-machine, the combination, with a carriage, and an innerand an outer cam secured to the carriage and havinga raceway betweenthem, said outer cam having a concavity at its inner end, of a rotatcble stud mounted in the carriage, a cam-block rigidly secured to saidstud and located in the concavity of the outer cam., said cam-blockhaving two operating-faces on opposite sides of the block removed fromthe axis of rotation of the stud and at unequal distances from suchaxis, each face, when in operative position, projecting inward beyondthe inner end of the outer cam, a spring normally tending to force thecam-block downward, a knob at the upper end of the stud and providedwith a downward-projecting teat,and a block Xed to the carriage andprovided with two recesses one hundred and eighty degrees apart andarranged to receive the teat, substantially as set forth.

'In testimony that we claim the foregoing as our invention we havesigned our names in presence of two subscribing witnesses.

HEINRICH STOLL. FRIEDRICH MAERCKLIN. Witnesses:

CARL HUBER, ANTON EIFERT.

